As long as you have the original bushing in reasonably decent condition, you can easily make your own. Purchase a pound of Flexane 94 (it won't be cheap...probably $50 or $60 in 2014 dollars), but you can make lots of things with it. I've made motor mounts, transmission mounts, O rings for carb to air cleaner seals, etc. Use the old bushing to create a mold using plaster of paris. You will need a two piece mold, and for shouldered bushings like this I've also used a piece of metal or smooth wood for the center piece. If you're lucky you can also use plaster of paris to make the center piece and just fill from the top. Note: The shoulder will facing upward if you're doing this correctly...please don't place it at the bottom as it probably won't fill up correctly. Rub Vaseline on the plaster mold you've made, position the center piece very carefully and if you can figure out how to keep it from moving, you'll be miles ahead. Mix the flexane according to directions and pour into the mold carefully. Leave it alone overnight...give it time to cure really well. Then remove from your mold and you're good to go. I know...the Flexane people will say you can remove it from the mold in something like 6 hours, but my experience is you should give it plenty of time for the reaction to be finished. Good luck.
Jon